上传照片的按钮怎么编写，需要什么控件吗

还有怎么显示图片，数据库里的表里只有图片文件名元素，

解决方案 »

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上传按扭的图片： <input type="file" id="upload" />显示图片：从数据库中取出文件路径及名称，用action或者servlet得到文件，转换成byte[]格式，然后
response.setContentType("image/jpeg");
OutputStream out = response.getOutputStream();
out.write(byte[]);
以下是将inputStream转换成byte的方法，楼主可以参考
//将stream转化为byte
private byte[] inputStreamToByte(InputStream inStream)
{
if(inStream != null)
{
try {
    ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
    int ch;
    while ((ch = inStream.read()) != -1) {
        byteStream.write(ch);
    }
    byte imgData []=byteStream.toByteArray();
    return imgData;
    } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
    }
}
return null;
}
控件可以用commons-fileupload-1.2.jar等很多
用jspSmartUpload组件上传~~
存数据库的时候存图片的名称和路径就成了,当然,象大小等信息也可以存
Struts fu.jsp
<%@ page language="java" pageEncoding="gb2312"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html"%>

<html>
<head>
<title>JSP for FuForm form </title>
</head>
<body>
<html:form action="/fu.do" method="POST" enctype="multipart/form-data">
<html:file property="file"/>
<html:submit/> <html:cancel/>
</html:form>
</body>
</html> imgs.jsp
<%@ page language="java" pageEncoding="gb2312"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html locale="true">
   <head>
     <title>imgs.jsp </title>
    </head>

   <body>
   <img src="${namePath}" />
   </body>
</html:html> error.jsp
<%@ page language="java" pageEncoding="gb2312"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html>
   <head>
     <title>error.jsp </title>
    </head>

   <body style="font-size:12px">
     <font color="red">${str} </font>
   </body>
</html:html> FuAction.java
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
FuForm fuForm = (FuForm) form;// TODO Auto-generated method stub
Session ses = HibernateSessionFactory.getSession();
Transaction tra = ses.beginTransaction();
Imgs imgs = new Imgs();
ImgsDAO idao = new ImgsDAO();
String fu = ".jpg ¦.gif";
Pattern pa = Pattern.compile(fu);
FormFile ff = fuForm.getFile();
String fileName = ff.getFileName();
String pathName = "/Fu/imgs/" + fileName;
System.out.println("fileName"+fileName);
int fileSize = ff.getFileSize();
List list = idao.findByNamePath(pathName);
if(fileSize > 5000){
String str = "您上传的图片过大！";
request.setAttribute("str", str);
return mapping.findForward("error");
}else if(list.size() > 0){
String str = "您上传的图片已存在！";
request.setAttribute("str", str);
return mapping.findForward("error");
}else{
imgs.setNamePath(pathName);
idao.save(imgs);
tra.commit();
}
String fileType = ff.getContentType();
System.out.println("fileType"+fileType);
Matcher mat = pa.matcher(fileName);
if(mat.find()){
System.out.println("是否找到："+"find");
try{
byte b[] = ff.getFileData();
String namePath = "D:\\java\\Fu\\WebRoot\\imgs\\"+fileName;
FileOutputStream fos = new FileOutputStream(namePath);
fos.write(b);
fos.close();
System.out.println("文件名："+fileName);
}catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}else{
System.out.println("是否找到："+"not find");
}
System.out.println(list.size());
imgs = (Imgs) list.get(0);
System.out.println(imgs.getNamePath());
request.setAttribute("namePath", imgs.getNamePath());
return mapping.findForward("imgs");
} FuForm.java
private FormFile file;
public FormFile getFile() {
return file;
} public void setFile(FormFile file) {
this.file = file;
} 数据库就两个字段
id identity(1,1)
NamePath
我也是用的commons-fileupload-1.2.jar在<html>标签中只传如上传成功后的文件名.